Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)

Peter Jenniskens; Nick Moskovitz; Laurence A.J. Garvie; Qing Zhu Yin; J. Andreas Howell; Dwayne L. Free; Jim Albers; David Samuels; Marc D. Fries; Prajkta Mane; Daniel R. Dunlap; Karen Ziegler; Matthew E. Sanborn; Qin Zhou; Qiu Li Li; Xian Hua Li; Yu Liu; Guo Qiang Tang; Kees C. Welten; Marc W. Caffee; Henner Busemann; Matthias M.M. Meier; David Nesvorny

doi:10.1111/maps.13452

Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)

Peter Jenniskens, Nick Moskovitz, Laurence A.J. Garvie, Qing Zhu Yin, J. Andreas Howell, Dwayne L. Free, Jim Albers, David Samuels, Marc D. Fries, Prajkta Mane, Daniel R. Dunlap, Karen Ziegler, Matthew E. Sanborn, Qin Zhou, Qiu Li Li, Xian Hua Li, Yu Liu, Guo Qiang Tang, Kees C. Welten, Marc W. CaffeeHenner Busemann, Matthias M.M. Meier, David Nesvorny

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Abstract

The trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep ~21° inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 ± 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9–29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 ± 20 cm in diameter assuming the density was 3.5 g/cm³. The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 ± 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 ± 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.

Original language	English
Pages (from-to)	535-557
Number of pages	23
Journal	Meteoritics and Planetary Science
Volume	55
Issue number	3
DOIs	https://doi.org/10.1111/maps.13452
State	Published - Mar 1 2020
Externally published	Yes

Funding

We thank the White Mountain Apache Tribe for supporting this study. We thank the referees’ careful reading of the manuscript and their helpful comments, as well as providing the meteoroid orbital elements at the Earth's Hill sphere. The Spalding Allsky Camera Network is a joint project with the Florida Institute of Technology, Melbourne, Florida. This work was in part supported by the NCCR “Planet S” of the Swiss NSF. This work was also supported by NASA grant NNX14-AR92G (PJ), NNX16AD34G (QZY), 80NSSC18K0854 (PJ, KW, QZY), and by the NASA Ames Asteroid Threat Assessment Program (PJ).

Funders	Funder number
NASA Ames Asteroid Threat Assessment Program
NCCR
National Aeronautics and Space Administration	80NSSC18K0854, NNX16AD34G, NNX14-AR92G
Florida Institute of Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

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Jenniskens, P., Moskovitz, N., Garvie, L. A. J., Yin, Q. Z., Howell, J. A., Free, D. L., Albers, J., Samuels, D., Fries, M. D., Mane, P., Dunlap, D. R., Ziegler, K., Sanborn, M. E., Zhou, Q., Li, Q. L., Li, X. H., Liu, Y., Tang, G. Q., Welten, K. C., ... Nesvorny, D. (2020). Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona). Meteoritics and Planetary Science, 55(3), 535-557. https://doi.org/10.1111/maps.13452

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title = "Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)",

abstract = "The trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep ~21° inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 ± 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9–29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 ± 20 cm in diameter assuming the density was 3.5 g/cm3. The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 ± 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 ± 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.",

author = "Peter Jenniskens and Nick Moskovitz and Garvie, {Laurence A.J.} and Yin, {Qing Zhu} and Howell, {J. Andreas} and Free, {Dwayne L.} and Jim Albers and David Samuels and Fries, {Marc D.} and Prajkta Mane and Dunlap, {Daniel R.} and Karen Ziegler and Sanborn, {Matthew E.} and Qin Zhou and Li, {Qiu Li} and Li, {Xian Hua} and Yu Liu and Tang, {Guo Qiang} and Welten, {Kees C.} and Caffee, {Marc W.} and Henner Busemann and Meier, {Matthias M.M.} and David Nesvorny",

note = "Publisher Copyright: Published 2020. This article is a U.S. Government work and is in the public domain in the USA.",

year = "2020",

month = mar,

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doi = "10.1111/maps.13452",

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Jenniskens, P, Moskovitz, N, Garvie, LAJ, Yin, QZ, Howell, JA, Free, DL, Albers, J, Samuels, D, Fries, MD, Mane, P, Dunlap, DR, Ziegler, K, Sanborn, ME, Zhou, Q, Li, QL, Li, XH, Liu, Y, Tang, GQ, Welten, KC, Caffee, MW, Busemann, H, Meier, MMM & Nesvorny, D 2020, 'Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)', Meteoritics and Planetary Science, vol. 55, no. 3, pp. 535-557. https://doi.org/10.1111/maps.13452

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T1 - Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)

AU - Jenniskens, Peter

AU - Moskovitz, Nick

AU - Garvie, Laurence A.J.

AU - Yin, Qing Zhu

AU - Howell, J. Andreas

AU - Free, Dwayne L.

AU - Albers, Jim

AU - Samuels, David

AU - Fries, Marc D.

AU - Mane, Prajkta

AU - Dunlap, Daniel R.

AU - Ziegler, Karen

AU - Sanborn, Matthew E.

AU - Zhou, Qin

AU - Li, Qiu Li

AU - Li, Xian Hua

AU - Liu, Yu

AU - Tang, Guo Qiang

AU - Welten, Kees C.

AU - Caffee, Marc W.

AU - Busemann, Henner

AU - Meier, Matthias M.M.

AU - Nesvorny, David

N1 - Publisher Copyright: Published 2020. This article is a U.S. Government work and is in the public domain in the USA.

PY - 2020/3/1

Y1 - 2020/3/1

N2 - The trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep ~21° inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 ± 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9–29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 ± 20 cm in diameter assuming the density was 3.5 g/cm3. The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 ± 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 ± 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.

AB - The trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep ~21° inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 ± 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9–29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 ± 20 cm in diameter assuming the density was 3.5 g/cm3. The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 ± 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 ± 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.

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Orbit and origin of the LL7 chondrite Dishchii'bikoh (Arizona)

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